Steam-boiler furnace



(No Model.) 2 Sheets-Sheet I. C. T. ROGERS. STEAM BOILER FURNACE.

'N0.595,341 Patented Dec. 14,1897.

AVL KM/JW (N0 Model.) 2 Sheets-Sheet 2.

0. T; ROGERS.

STEAMBOILER FURNACE. No. 595,341. Patented Dec. 14,1897;

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UNrrnD STATES PATENT OFFICE,

CHARLES T. ROGERS, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO GEORGE F. KLOTTER & (30., OF CINCINNATI, OHIO.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 595,341, dated December 14, 1897.

Application filed March 5, 1896. Serial No. 581,899. (No model.)

To aZZ whom it may concern:

Be it known that 1, CHARLES T. ROGERS, a citizen of the United States, residing at Detroit, Michigan, have invented new and useful Improvements in Steam-Boiler Furnaces,

of which the following is a specification.

My invention relates to steam-boiler furnaces, its object being primarily to economize in the use of f uel-that is to say, to obtain the maximum evaporative results from the fuel employed and to avoid the production of smoke -and also to improve the durability and continued efficiency of the boiler-setting without materially increasing the ini- I 5 tial expense of construction.

To these ends my invention consists in the construction and arrangement of the steamboiler furnace and setting, hereinafter more particularly described, wherein are embodied 2o departures from the ordinary usage in certain particulars following.

The boiler is suspended by links hung from gallows-frames independently of the furnacewalls at a height approximately equal the diameter of the boiler-shell above the gratebars and above a low bridge-wall. In rear of the bridge-wall is located an enlarged combustion-chamber extending from the level of the ash-pit rearwardly to the rear furnace-wall.

The grate bars preferably incline downward rearwardly, and the top of the bridge-wall is below the extended plane of air-blast openings through the front wall above the firedoors. I provide also a perforated dead- 3 5 plate in front of the grates, whereon the green coal is partially coked before final combustion upon the grate. The air-blast is operated by live-steam jets regulated as occasion requires.

The details of construction and function of the various features will more clearly appear in the following specification and description of a boiler furnace and setting embodying my invention and illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a cylindrical return-flue steam-boiler and setting, in which the furnace-walls are sectioned in the vertical axial plane of the boiler and the various features of construction indicated; Fig. 2, a similar cross sectional elevation of the same; Fig. 3, a plan view of the front of the furnace, showing the dead-plate and indicatin g the relative position of the air-blast opening; and Fig. 4 is a partial section of the deadplate, showing the character of its openings. Referring now to the drawings, A designates a cylindrical return-flue boiler of the type commonly employed in industrial power plants, hung by links I) from cross-braces B, supported upon columns B. I prefer to con struct the braces B of channel-beams placed back to back, between which extend the links 6, whose threaded ends are provided with nuts resting upon the upper sides of the braces. The lower ends of the links are hooked into cleats a, riveted to the boiler-shell. The brick side walls O of the furnace are built up around the columns B, which renders further bracing unnecessary; but the weight of the boiler is taken entirely by the frames without resort to the walls as a means of support.

The side walls 0 are preferably joined by an arch c at the rear by the rear wall 0 and at the front by the front wall C the proper openings being provided, forming an inclosed setting of greater than the usual height, in which the boiler is independently hung, thus allowing expansion and contraction of either boiler or furnace walls, each independently of the other.

The fire-door opening of the front wall O is bridged below by a dead-plate D, widened rearwardly to match the grate G, with which it connects. This plate is pierced by a multitude of small openings, as shown in Figs. 3 and 4:, which flare downwardly and open into the ash-pit below. The usual fire-doors are provided, opening upon the dead-plate D. From the dead-plate D the grate G extends o rearwardly at a slight downward inclination to a bridge-wall c, rising from the bottom of the ash-pit but little above the grate, with a rearward inclination at its upper portion, and the entire cavity beneaththe boiler in rear of the bridge-wall is open and unobstructed back to the rear wall of the furnace at or approximately at the bottom level of the ash-pit. Above the fire-doors D the wall 0 is pierced by air-passages 0, (usually three in the same horizontal line,) inclined downwardly, so as to direct the air-blast just over the top of the bridge-wall into the depressed chamber behind. A steam-pipe E, supplied from the boiler, is fitted with a discharge-nozzle e, extended into the openings 0, and with a governing-valve E furnishes the blast power to siphon air mixed with steam.

The operation is as follows: WVhen the furnace is in operation, the fresh coal is first dumped on the dead-plate D. The plate is kept relatively cool by the contact of air below, which is drawn up through its apertures and through the mass of fresh coal to supply the surface incandescence produced by contact of the adjacent incandescent coal upon the grate, and by the flaming gases of combustion drawn forward by the eddy resulting from the discharge of the air-blast rearwardly above, as indicated by the arrows, Fig. 1. The main force of the blast in separate streams plays rearwardly, just clearing the bridge-wall, producing eddies behind the latter tending to seize and mingle the gaseous products with the air necessary for their combustion. A general circulation of the flaming gases of combustion is established, as also indicated by the arrows, by which they are carried first away from the boiler until thoroughly inflamed and thence upward and forward in contact with the boiler before finally passing rearwardly to the mouth of the returnfiues. The gases of combustion are thus thoroughly inflamed before being brought into contact with the boiler, with the result of perfect combustion and absence of smoke.

When fresh or green coal is introduced, the partially-coked mass is first pushed back upon the grate from the dead-plate and suitably distributed upon the latter and a new charge deposited upon the dead -plate. It will be seen that the smoke and gases from thefresh coal are first carried directly over the partially-spent coals and mingled with the gases of the latter, and the efficiency of this mode of treatment in securing combustion will be obvious.

While I prefer to use a dead-plate, it is not essential, and its office may be performed by a forward extension of the grate. I may also connect the air-passage c with suitable heating-ducts arranged in the side walls or elsewhere to heat the air before discharging into the furnace; but as these are common expedients I have not thought it necessary to illustrate or describe further.

I claim as myinvention and desire to secure by Letters Patent of the United States 1. In a steam-boiler furnace, the combination of a fire-door, a relatively low grate extending rearwardly from the fire-door, a relatively low bridge-wall, an enlarged combustion-chamber in rear of and below the bridgewall, an air-blast apparatus, arranged above the fire-door to discharge rearwardly above the grate at a downward inclination over and adjacent to the top of the bridge-wall and produce eddies behind and in front of the same, substantially as set forth.

2. In a steam-boiler furnace, the combination of a perforated dead-plate immediately in rear of the fire-door, a relatively low grate extending thence rearwardly with a downward inclination, a relatively low bridgewall, an enlarged combustion-chamber, in rear of and below the bridge-wall, and a series of air-blast nozzles above the dead-plate, arranged to discharge rearwardly at a clownward inclination across and adjacent to the top of the bridge-wall and produce eddies in rear and front of same, substantially as set forth.

3. The improved steam-boiler furnace and setting, embodying a boiler suspended independently between side walls, relatively high above the grate, a grate inclined downwardly, a relatively low bridge-wall, a combustionchamber in rear of the bridge-wall, and a series of air-inlets through the front wall over the fire-door opening, and steam-jet pipes arranged to discharge in said air-openings and direct the blast downwardly over and adjacent to the top edge of the bridge-wall and produce a downward eddy in the combustion-chamber and eddies in front of the bridge-wall, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CHARLES T. R0 GEES.

Witnesses:

CA B. DASH, TURNER STANTON. 

